Flacco tossed for 309 yards 25-of-36 efficiency with no interceptions as the Ravens (10-5) snapped a three-game losing streak and claimed their second divisional title in two years.
New York (8-7), meanwhile, fell for the second straight week and dropped a game behind Washington in the NFC East as Eli Manning was held to 150 passing yards and a touchdown.
The Giants' offense could muster only 186 yards of total offense in the setback.
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